Raskin started the first three games of Rangers’ season, but was left out of the starting XI for the first leg of the tie against Viktoria Plzen, which Martin’s side won 3-0 at Ibrox.
The 24-year-old was again benched for Saturday’s Premiership match against Dundee, but impressed as a substitute in the 1-1 draw.
Martin expressed his delight at how Raskin has responded to being dropped.
“He came out of the team for reasons that me and him spoke about, and his reaction has been top, like really, really brilliant,” he said.
“He’s a really fantastic player, and he’s a young man that I’m getting to know all the time, and actually I really like his character and personality.
“It’s my job to make sure, playing for this football club, whoever you are, the demands are really clear, in whatever position you play.”
